Okay, this is bloody clever. Yvonne Chua is a recent graduate from the Industrial Design course at NUS. She says:

“A vase of flowers is a spot of
colour in the room, a bit of life, and maybe joy. But do we necessarily
need physical objects to fulfill that purpose? Maybe a shadow, changing
as light changes in the room, and forming, magically, a familiar shape
can serve to bring just as much interest.""